Continuity mistake: Near the end when Howie is in the cage and praying, one shot shifts to the line of watching islanders. Summerisle walks towards them, turns and signals with his left arm. Cut back to Howie in the cage, then back to the islanders. The same sequence of Summerisle walking and signalling is then shown again.
Continuity mistake: When Sgt Howie is unable to start the plane, he calls the harbour master. While the harbour master is rowing back he calls out to Sgt Howie "what's the matter, won't she go?" Notice that when he begins this question he is nowhere near the plane, but as he is finishing the question, he is now alongside the plane.
Continuity mistake: In the scene where Howie questions the Doctor about Rowan Morrison's death certificate, the Doctor is seen to open his front door and step partly inside. The shot cuts away, and when it cuts back to the Doctor his front door is shut. He opens it again and goes in.
Continuity mistake: Edward Woodward's Sergeant Howey is aroused by Britt Eckland's Willow on the other side of the wall and touches the wall and jogs a picture so that the bottom shifts rightwards so that the picture is not straight. Then the sergeant edges backwards and the picture is straight.
Continuity mistake: In the extended version of the film, in the scene at the police station, Officer McTaggart is reading the letter to Sgt. Howie about the missing girl on Summerisle. There's a photo of the girl included with the letter, which McTaggart holds in his right hand to look at. The next shot is a close up of the photo, which shows it being held in the left hand. The next shot of McTaggart holding the photo again shows the photo in his right hand.